Tie-back hook



FIG. 1 is a side elevational view of a tie-back hook showing my new design, the undisclosed rear being a mirror image;

FIG. 2 is a side elevational view thereof with the gate-keeper in an opened position;

FIG. 3 is a top plan view of FIG. 1;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a left side elevational view thereof; and,

FIG. 6 is a right side elevational view thereof. 

The ornamental design for a tie-back hook, as shown and described. 